Please send me the question answer

Solution:

Ans. Option C) is the correct option: $\angle ECF is adjacent to \angle BCE.$

Two angles having a common vertex and a common arm such that the other two arms of the angles are on the opposite sides of the common arm, are known as adjacent angles. 

In the given figure, angle AOB and angle BOC are adjacent angles, since they have a common vertex O, a common arm OB and their other arms OA and OC are on the opposite sides of the common arm OB.